Security fence



FIG. 1 is a front perspective view of the security fence;

FIG. 2 is a rear perspective view of the security fence;

FIG. 3 is an enlarged detail view of the security fence taken from FIG. 2;

FIG. 4 is a front view of security fence;

FIG. 5 is a rear view of the security fence;

FIG. 6 is a left-side view of the security fence;

FIG. 7 is a right-side view of the security fence;

FIG. 8 is a top view of the security fence; and,

FIG. 9 is a bottom view of the security fence.

The broken-lines depict the limits of the enlarged detail view and form no part of the claimed design. 

CLAIM The ornamental design for a security fence, as shown and described. 